MacDon A40-D Pull-Type - Manual (Page 84)

SECTION 6 OPERATION
169000
82
Revision F
6.17.10 Header Flotation
Header flotation springs are normally set so
70 lbf (311 N) is required to lift either end of the
header just off the ground. In rough or stony
conditions, it may be desirable to change setting
to 35–50 lbf (156–222 N) to protect
cutting components.
NOTE
When float setting is light, it may be
necessary to use a slower ground speed
to avoid excessive bouncing, and
leaving a ragged cut.
6.17.10.1 Flotation Adjustment: Self-Propelled
Header float can be hydraulically adjusted from
the cab, without shutting down the windrower.
To adjust float, refer to your self-propelled
windrower operator’s manual.
6.17.10.2 Flotation Adjustment: Pull-Type
IMPORTANT
Float setting (or lifting force) must be
equal on both ends of the header. LH and
right ends require different spring lengths
to achieve equal float at both ends.
IMPORTANT
Because header weight transfers to
outside tire whenever header is swung
from one side to the other, tires must be
fully inflated (30 psi [207 kPa]) to minimize
effects on header float.
CAUTION
To prevent accidental movement of
windrower, place all controls in NEUTRAL or
in PARK, engage park brake (if applicable),
shut off engine, and remove key.
a. Position header directly behind tractor, and raise
header fully.
b. Stop engine, remove key, and engage lift
cylinder lock-outs.
c. Back jam nuts (A) away from spring.
d. To increase flotation, turn adjuster bolts (B)
clockwise (further into spring).
To decrease flotation, turn adjuster bolts (B)
counterclockwise.
NOTE
Springs must be adjusted in pairs.
e. Tighten jam nuts (A) against spring inserts to
secure the setting.
f. Lower header, and check header flotation at
each end.
NOTE
Other operating variable adjustments
may affect float setting. Check the float,
and readjust if necessary after adjusting
reel position, cutting height, or
header angle.
Also, if using a tractor with drawbar
height different than 16 in. (406 mm)
flotation will be affected. Adjust
as required.
B
A